Noble M12 GTO3

[l2oyn]

Last time I drove my car in december I had a small bit oil burning in one of the exhausts when I got back. I let it tick over and a couple of minutes later it cleared. I started the car yesterday and it fired up perfectly. It ticked over for about a minute and I gave a blip on the throttle(maybe 2000rpm) and the engine note changed. Normally its quite basey and raspy but it became more high pitched/quieter and did not want to exceed more than 2000-2500 rpm.

Any suggestions please?

[l2oyn]

Cheers, really apreciated